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Some people have been known to see past 60 frames per second. That being said, those same people probably would also find the jumping framerate to be annoying. So to answer your question, its probably to compensate for something :-P
Because the higher the FPS the smoother/more responsive the game looks and feels. It doesn't matter how many frames per second that your eyes can perceive because 1) everybody is different and 2) the frames are not actually in sync with your eyes.